because a hydraulic piston is better than a mechanical shaft turning a pitman arm.
with ram assist power is put into the steering through the piston directly. aside from hydraulic hoses, there is no "weak" link between the drivers input and the power that is put out.
with a strong steering box. from the driver it goes into the box, into the sector shaft, into the draglink.
potential point of issue could be the frame rail where the box is mounted to to the draglink. if that steering box can turn 40's standing still, there is a lot of power in it that could also rip itself off a frame rail.
did hydro assist and never turned back.
yes i may have spent more on my PSC (although there are much cheaper setups), but i have no doubt of its reliability and i know i can steer with confidence.
if my ram were to ever overpower my steering components, the only potential breaks would be from the tie-rod and out.
if you get a steering box that ever overpowered your components, you can have a mess and a half on your hands
MISHIMOTO IS JUNK